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Reply to my friends little brother understood meaning of money by Lelouch4339

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DemetriiOSC t1_j90qfbg wrote

Reply to comment by Sunspider2 in Tortoise vs Hare by toonhole

A bullets’ terminal velocity required to penetrate the skin is between 45.1 and 60.0 m/s (148 and 197 ft/s) and bullets traveling at <60.0 m/s (200 ft/s) can penetrate the skull.

In the launch angle region of 80º…90º the bullet basically lands the base first. The terminal velocity might vary between values 40…85 m/s. The result depends on possible Magnus-moment caused bullet instability or the bullet/flow resonance. The buffeting-like phenomenon described is new to the authors of the current paper at this particular context. However, the flow time-dependent phenomena detected were found out to have negligible effect on flight without matching of the natural frequencies (flow/bullet).

Experimental result found for an upwards fired 7.62 mm bullet terminal velocity is about 90 m/s, which is near to the base first landing case simulated result. The typical terminal velocities given in literature for spent bullets are from 300 fps to 600 fps (90...180 m/s).

In many simulated cases through the launch angle region the bullet possessed the estimated minimum lethal energy 40 J at the end of trajectory. The skull penetrating speed 60 m/s was mostly clearly exceeded. A preliminary value for shooter-centered danger zone diameter obtained was found out to be approximately 8 km.

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